Aquaplanet

Summary

The aquaplanet configuration in CESM allows the user to run CAM above an entirely ocean covered surface. The surface model is essentially a data ocean model where SST has to be specified. There are a standard set based on the AquaPlanet Experiment project (Neale & Hoskins, Williamson). The advantage of an aquaplanet configuration is that it allows the user to run the full CAM parameterization suite while retaining much simpler surface conditions than the complex combintation of land, ocean and sea-ice seen in the real world. This configuration is frequently seen as a bridging test of a GCM bewteen more idealized dynamical core experiments with rudimentary represenations of physical processes and and prescribed SST AMIP experiments. The CAM5 aquaplanet configuration is described by Medeiros et al. (2016).

CESM Options

CESM2

In CESM2 the aquaplanet is more fully
supported than ever before. Use compsets QPC6
(or QPC5, QPC4) for fixed-SST aquaplanets. Use
QSC6 (QSC5, QSC4) for slab-ocean
configurations. Additional details in the
CESM2 Users Guide.

CESM1

Aqua-planet simulations can be run in CESM using the following compsets:

FC4AQUAP, FC5AQUAP

Be aware that these may not produce a
"reference" aquaplanet (Medeiros et al. 2016)
due to the default settings and boundary
conditions that the model retrieves.

CESM1 SOM-Aquaplanet

Running the slab-ocean aquaplanet is not currently (CESM1) implemented as a standard compset. An experimental configuration can be achieved with a few steps. Notes on one approach are included in the file available for download here.